Computing mechanism.



W. WRIGHT.

COMPUTING MECHANISM.

APPLICATION FILED SEPT.28,190&

1,105, 1 70. Patented July 28, 1914.

2SHEETSSHEET1.

INVENTOR,

ATTORNEY FIG.5.

W. WRIGHT.

COMPUTING MECHANISM.

APPLIGATION FILED SEPT. 28, 1908.

Patented July 28, 1914,

2 SHEETSSHEET 2.

UNITED STATES PATENT OFFICE.

NEW YORK.

To all whom itmay concern: 7

Be it known that I, WALTER WRIGHT, a citizen of the United States, residing at San Francisco, in the county of San Francisco and State of California, have invented new and useful Improvements in Computing Mechanism, of which the following is a specification.

The present invention relates to mechanism for computing machines, either attached to a typewriter, or used independently, as may be desired. In my pending application 286,368, is disclosed a row of cooperative computing wheels extending the entire length of the typewriter carriage.

The object of the invention is to provide means whereby computation can be commenced at any point of a row of computing wheels.

A further object is to lim t the distance through which the transfer is carried, whereby where a continuous series of computing .wheels is provided of great length, as set forth in said application, computation can be doneat any point in the series, without in any case carrying tens beyond the particular field or zone that is selected for the computation; such zone being of courselocatable at any desired point in the line of writing.

Another feature of the invention is the provision of an improved tens-carryingmechamsm. The number wheels are lockedagainst rotation, except at the point where" the master-wheel is operating at any time.

. The unlocking of the number wheels proceeds automatically during the run of the carriage.

Other features and advantages will hereto inafter appear.

In the accompanying drawing, Figure 1 is a broken plan view, partly in horizontal section, of a series of computing wheels, and the transfer mechanism therefor, constructed in accordancewith my invention; Fig. 2 is a vertical section on the line 2- -2 of Fig. 1 looking to the left; Fig. 3'is'a section on the line 33 of Fig. 1 looking to the right; Fig. 4-is a perspective view of a transfer wheel detached. Fig. 5 is a plan view showing the computing mechanism as mounted on an Underwood typewriter.

' For convenience the present invention Specification of Letters Patent.

Application filed September 2a, 190 Serial No. 455,226.

WALTER WRIGHT, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO UNDERWOOD COMPUTING MACHINE, COMPANY, A CORPORATION OF COMPUTING MECHANISM.

Patented July 28, 1914.

will be described as applied to computing mechanism used on a typewriting machine, but it is understood that the invention is not limited thereto. As shown, the apparatus is actuated by a rotary internal driving shaft, over which the computing wheels move step by step, or the computing wheels are stationary and the operating device on the driving shaft can move through said 7 wheels on said shaft. However, the invention is not limited to an internal drive, as the wheels can also be rotated by means of external gear teeth thereon.

The computing wheels 1 preferably extend through a distance corresponding to the writing line of the typewriter, there being onecomputing Wheel for each writing space of the typewriter, excepting each fourth space, at which the computing mechanism is .01 pins 7 extending laterally from a computing shaft 8. These pins are preferably formed upon a stationary collar mount-ed upon the free end of-the computing shaftand rivetedthereto. The collar and pins taken together form a master wheel. Said collar is formed with a rounded or tapered end 9, and the collar at the point from which the operating pins project, is of the same diameter as the internal diameter of the internal gear teeth of the hub. Each wheel 1 is supported by means of a thin hub 10 in 'a bearing formed in a thin supporting plate 11, all of said supporting; plates being formed with rearward extensions which rest in vertical slots 12 formed in a back plate 13. which when the gang of wheels 1 is movable in letter-feeding direction, forms the back of the computing carriage, and is-advanced step by step, with a paper carriage, when the latter is used. Each of said supporting plates is formed with a recess 14,

which fits around the upper edge of the back plate 13 which lies below the corresponding slot, so that said supporting plate is very firmly supported upon sai back plate. 0n the right hand side of said web 4, looking from the front, the hub of the computing wheel is formed with external gear teeth 15, preferably forty in number, and on the same side ofthe web, the web of the wheel is formed on its inner surface with internal gear teeth 16 'of twice the number of teeth as the teeth 15 upon the hub. 'On the left hand side of the web, the hub is .formed with a smooth circular contour 17, except at one part thereof, where it is formed with a recess 18 into the center of which extends laterally a pin 19 from the web 4, said recess being for the purpose of permitting said pin 19 to properly engage a transfer wheel 20.

There is a transfer wheel 20, corresponding to each numeral wheel, part of which transfer wheel engages the numeral wheel on the right, and the other part engages the numeral wheel on the left. These transfer wheels are centrally supported by means of plates 21, which are of the same thickness as the supporting plates 11, and are extended rearwardly, and can slide baclrwardly and forwardly in the same slots in the back plate 13, as contain the supporting plates, to cause the transfer wheels to engage either the internal gears 16 or the gears 15. Each transfer wheel comprises, on the right hand side of said sliding plate 21, a Geneva stop wheel 22, having four concave sides 23, each adapted to fit snugly against the smooth circular portion 17 of the hub portion of the numeral wheel on the right, and also having between said sides four recesses 24 adapted to receive the pin 19 on the web of the numeral wheel on the right. On the left hand side of the slide plate, said transfer wheel is formed with teeth 25, thenumber of which is four-tenths of the number of external teeth 15 on each numeral wheel, and which engage said teeth 15 on the Wheel on the left.

\Vhen any numeral wheel is rotated, so as to make a complete revolution, and thereby the pin 19 comesinto and passes out of con-- tact with the Geneva. stop wheel, it rotates said wheel through one-fourth of a revolution, thereby, by reason of the gear teeth 25 on' the transfer wheel meshing with the gear teeth 15 on the hub of the numeral wheel to the left, rotating said latter wheel one-tenth of a revolution. In this manner, it is possible to transfer from one wheel to the next on the left in the operations of addition and subtraction. It will "be observed, however, that any wheel the external hub teeth 15 of which are in engagement with the teeth 25 of the transfer wheel is locked, and cannot be moved, until the pin-19 on the numeral wheel to the right has arrived at a recess 23 in the Geneva part of the transfer wheel 20. It will therefore be seen that no ccmputing wheel 1 can be freely operated unless the transfer wheel 20 is moved out of contact with the hubs of said wheel, and of the wheel 1 on the right. It is to enable a numeral wheel to be so operated at the writing point of the typewriter or at the operating point that the plates 21 which carry the transfer wheels 20 are made slidable, and means are provided for automatically sliding such plate at the right ofeach numeral wheel, as it arrives at the operating point, where it is rotated by the lugs 7 on the computing shaft 8. In order to so slide it, there is provided a roller 26 on a stationary vertical shaft 27 supported by the frame 28 of the typewriting machine or other support, which roller 26, is received in succession in recesses 29 formed in the lower edge of the slide plates 21. As in the step by step advance of the computing wheels each slide plate 21 arrives at the roller, said slide plate is thereby moved rearwardly, causing the transfer wheel also to move rearwardly, thus disengaging the transfer wheel from the hubs of the corresponding adjacent numeral Wheels, and permitting of operation of the movement of the carriage, the slide plate is released from engagement with the roller 26 and is pressed forward by means of a spring 30 carried by the computing wheel support and engages a lug 31 on said plate 21, and thereby said plate and the transfer wheel are again moved forward, so that the latter is in its operative position.

The object of the internal teeth lb formed numeral wheels is to insure that the transfer wheel can never be moved into such position that it will not, when returned to its operative position, properly engage the surfaces on the hubs of the numeral wheels. The internal teeth 16 accomplish this object; first, because the distance between the external teeth 15 and the internal teeth 16 is greater than the diameter of the gear wheel formed upon the transfer wheel by an excess which is less than the depth of each tooth 25 on the transfer wheel, so that, before said teeth 25 have fully left the teeth 15, they are also in mesh with the internal teeth 16; second, when said teeth 26 are out of mesh with thiteeth 15 and in mesh with the internal teeth 16, the angular distance through which the transfer wheel is rotated is always one-half a revolution or a multiple thereof. The reaalways turn through one-tenth of a revolution of a multiple thereof. If the teeth 25 are in mesh with the gear teeth 15, the trans: fer wheel is then rotated through one-fourth l of a revolution for'each one-tenthof a revonumeral wheel on the left. Upon the next upon the inner sides of the rims 2 of the son for this is, that the numeral wheels lutionof the numeral wheel. But if said teeth 25 are in mesh with the internal teeth 16, then the transfer wheel is rotated idly through twice that angular distance, because v there are twice as many internal teeth 16 as there are external teeth 15.. Consequently, for each tenth of a revolution ofa numeral wheel, the transfer wheel is, in the latter case, moved idly through one-half of a revo-' lution instead of one-fourth, which, however, always brings it into proper position, so that both the teeth 25, and also the concave portions of the Geneva stop part of the wheel, properly engage the corresponding parts on the hubs of the numeral Wheels, when returned. The above construction therefore dispenses with the necessity of providing any-special lockingtnieans for locking the wheels in position against erroneous rotation.

The inner surface of the rim of each numeral wheel to the left of the web is of sufliciently large diameter to permit the Geneva stop portion of the transfer wheel to rotate 5 freely within the same when moved to its rearward position, and the gear teeth of said transfer wheel are engaged by the internal rim teeth 19 of the next wheel to the left.

0 In order to positively hold each transfer wheel'in its proper position for transfer from one wheel to the next, there is provided a stationary rear .bar 32 which furnishes a rear stop against any rearward movement 5 of .the slide plates 21. At the same time the spring serves to take up any slack, and

holds the rear end of the slide plate just out of contact with the stop bar 32, so that said plate canmove with the computing carriage without friction against said stop bar. The stop bar is secured to the frame of the typewriter or other support and is made of a length corresponding to the width of the widest. column to be computed. At the end of said bar there is provided a second roller 33, precisely like the first, which again suc cessively engages the recesses in the slide plates, so that the transfer wheel opposite thereto, is again temporarily disengaged 0 from the hub, and it is therefore not possible to transfer beyond that point. This second roller is used as a safety device. For in stance, supposingv that the last wheel on the right of the entire computing mechanism was at the operating point, and all the wheels were at zero, and that an operator should shift the mechanism to perform subtraction, and then operate a numeral key. This would require a movement of the entire series of, say, (30 or more wheels from O to 9, which would render it impracticable to use a, series of connected wheels. co-extensive with the whole or a of ordinary or extrzuirdinary width.

-onsiderabl ,e portion of a typewriting line.

providing the above limit wheel, which is located at the extreme limit of the maximum Width to be computed, the effect of the operation above described is to throw to 9 only such wheels as are to the right of the limit Wheel, and to the left of the operating point. Thereby it is now permissible to use such a continuous series of wheels.

The casing 34 carrying the computing wheels is mounted by arms 35 on the traveling carriage 36 of a typewriter. Fixed arms .37 carry a sleeve 38 through which passes the shaft 8 driving the master wheel 7. This shaft is driven by gears 39 controlled by the numeral keys 40 by mechanism not shown. The bar 32 is fast to the frame 4-1 of the typewriter, and the rollers 20 and 33 are mounted on arms 42 and 43 respectively on said frame 41.

The computing wheels are spaced into groups of three, each group, together with the spacing means,'occupying four steps of the computing carriage, the last wheel in each group being connected with the first wheel of the next group, the computing wheels of every group being inoperative by the operation of a numeral key when used in each said fourth step, so that, when used with a typew'riting machine, printing may be done at each such fourth space, but if a numeral key should be inadvertently struck .at such fourth space, it cannot possibly actuate any computing wheels. The reasons for thus grouping the computing wheels, are as follows: First, to provide for spacing the groups of figures properly into hundreds, thousands, millions, billions, etc., and per mitting of a writing space in which to write a proper or suitable dividing means such as a comma or period, as in 4,567,546, or 2,345,654s87. WVhen writing dollars, the last group spacing is used for dividing the dollars from the cents, but the third or last wheel of the group does not count, but reanains at 0. This same arrangement also acts as a division between the different columns, which, when written as closely together as possible, will be separated by not less than one full writing space, though .cach column is carried to its fullest numerical capacity, as in the three columns 999 999 999,999. Second, to enable a given number of computing wheels, arranged as stated above into groups of three, to be. aitilized in a larger number of different columns of various widths, than is possible by any other arrangement By this grouping, the position of the columns may be raried at will, and small columns interspersed with larger ones to suit the conditions, and to utilize a given writing space'to the best advantage. This will be more readily seen when it is understood that, heretofore, registers have been made separate and inde- ,pendent, and of a capacity limited to the numbers of figures or columns that might be required in a column, and, while it is true that two independent columns might be computed upon one of these registers, it is also true that a part of a column could not be computed in one register, and another part of the same column in another register. Hence, whenever there is any lost space in one register, it is also lost in the writing line of the paper. With the above mechanism, this is overcome, so that in no instance is it necessary to lose more than three writing spaces, seldom more than one writing space, between one column and the next, and any group of three computing wheels can be used independently for an independent column of such capacity.

While I have herein shown the third wheel of a group as wider than the other two, in order to rovide a space within said wheel, correspon ding tothe fourth step of typewriting space, in which the driving mechanism is inoperative, yet this arrangement is not necessary, as, while it is preferable in all cases that at this fourth step or typewri ting space the driving mechanism should be inoperative,-the wheels may all be made of the same width, thereby permitting of an increase in the size of the num bers shown upon said wheels. This can evidently be done by making the hubs of uniform width, but locating the internal teeth asymmetrically thereon.

Several of the features herein iliistrated, for the purpose of showing the operation of my present invention, are disclosed and claimed in one or more of my co-pending applications 286,368, 505,492, 388,766. 411,245, and 428,020; but the devices claimed in the present application are not disclosed in any of my earlier applications aforesaid.

I claim 1. In a computing mechanism, a series of computing wheels, a series of transfer wheels respectively intermediate between the computing wheels to form a transfer train, a master wheel having a step-by-step motion relatively to the computing wheels, a device for effecting such step-bystep motion, means whereby the computing wheels are successively rotated by said master wheel, and means dependent on the movement of the step-by-step device for disengaging one of the transfer wheels from the corresponding computing wheels to break the train of transfer, substantially as described.

2. In a computing mechanism, a series of computing wheels, a series of transfer wheels respectively intermediate between the computing wheels, means whereby the comput ing'wheels are successively rotated, and two devices, spaced from each other a distance not less than the width of a plurality of such wheels, for disconnecting the corresponding transfer wheels from their respective wheels respectively puting wheels are tween said points,

whereby transfer is computing wheels,

substaneifected only between said points, tially asdescribed.

3. In a computing mechanism, a multiple series ofcomputing wheels, a series of transfer wheels respectively intermediate between the computing wheels to. form a transfer train, a master wheel having a stepby-step motion relatively to the computing wheels, a device for effecting such step-by-step motion, means whereby the computing wheels are successively rotated by said master wheel, means dependent on the movement of the step-by-step device for disengaging one of the transfer wheels from the corresponding computing wheels to break the train of transfer, and means for locking against rotation, except that caused by the transfer, all wheels except that at the operating point, substantially as described.

4- In a computing mechanism, a series of computing wheels, a series of transfer intermediate between the computing wheels, means whereby the comsuccessively rotated, means for disengaging one of the transfer wheels from the corresponding computing wheels to break the train of transfer, two devices, spaced from each other a distance not less than the width of a plurality of such wheels, for disconnecting the corresponding transfer wheels from their respective computing wheels, whereby transfer is effected only be.-

and means for locking against rotation, except that caused by the transfer, all wheels except that at the operating point, substantially as described.

5. In an apparatus of the character described, a series of computing wheels, a cor- .respondmg series of transfer wheels, and

means located at a point in the series of wheels for moving-i1 transfer wheel out of transfer engagement with the computing wheel while maintaining the same in rotary engagement therewith, substantially as described.

6. In an apparatus of the character described, a series of primary computing wheels, transfer wheels, each intermediate between two adjacent wheels and having a part in mesh with one of said computing wheels, a second part locked by the other computing wheel, said latter computing wheel havinga part adapted in its rotation to unlock and rotate said transfer wheels, and means for automatically withdrawing a transfer wheel from its locking position at a point in the series of wheels to break the transfer, and means to unlock a computing wheel to record a number, substantially as described.

7. In an apparatus of the character described, a series of computing wheels, transfer wheels, each intermediate between two adjacent wheels and having a part in mesh with one of said computing wheels, a second part locked by the other computing wheel, said latter computing wheel having a part adapted in its rotation to unlock and rotate said transfer wheel, and means for automatitially as described.

8. In an apparatus of thecharacter described,ja transfer wheel having an opera tiveand-an inoperative position, a computing wheel having an internal gear and an external gear arranged to engage a transfer wheel so as to always keep in mesh with it andarranged to be rotated by the transfer wheel in; its operative position, substantially as described.

9. Inan apparatus of the character de-' scribed, computing wheels, individual; supports for said computing wheels extending lnward from the outside between said wheels, transfer wheels, and individual supports for the transfer wh'eelsextending between the computing wheels from the outside, substan tially as described.

.10. In; an apparatus of the chara'ctcrdescribed, computing wheels, transfer wheels eachmoperatively connected with twoadjacentcomputing wheels, and each lying wit-hilrsaid wheels, anda movable support for .said transfer wheel extending from the outside between saidv computing wheels, substantially as described.-

1l', In an;- apparatus of the character descri-loed, computing wheels, transfer wheels each. operatively connected with: two adja- .-'cent-..co1"uputingwvhecls,and each lying within said wheels', and a slidable support for said transfer wheel extending from; the outside between said computing: wheels, sub stantially; as described.

12. Infian apparatus of the character-dascri'bed,;eompnting. wheels, transfer wheels each= operatively Yrclonnected with two adjacent coi'nputingsw transfer, wheel extending from the outside between said computing wheels, and anti-- scribed, a traveling gang vofcom uting wheels, transfer xwheels eachoperative y con-- nected with two adjacent computing wheels, and each lying within said.whee1s,a movable support for. said transfer wheel extending. from the outside between said COIl'lPllt-Hlg:

wheels, means for moving each support Km succession as it arrives at a predetermined point, and. means for; ,praventmgsuch moveeels, and each lying witl1-- in said wheels, a slidable support forsaidas described.

14. In an apparatusof the-character described, a traveling gang of computing wheels, transfer wheels each operativelyconnected with two adjacent computing wheels, and each lying within said-Wheels, a movable support for said transfer wheel extending fromthe'outside between said computing wheels, means for moving eaeh -support in succession as it arrives-at a pre-determined point, meansfor preventing such movement: after passing said point, and means for holding said movable support-out of engagement with said latter means to prevent friction: the-rebetween, substantially as described:

15. In anapparatus of thecharacter described, a traveling' gang"ofcomputing wheels, transfer' wheel's each operatively connected I withtwo adjacent computing .wheels,--and each lying within said wheels, :1 II IOVQblGiSHPPOI'lTfOI' said-transfer wheel extending fro -the outside between. said computing wheels, means for moving each support in suceession asitarrives at'a pre determined pointmeans for preventing such moWament-after passing said point, and aspring: arranged to'bear against said movable support, substantially as described.

16. In an apparatus of the character described, atraveling gang of computing wheels, transfer wheels each operat-ively connected with two adjacent computing wheels, and each lying withinsaid wheels, a=movable support forrsaid transfernvheclextending fromv thev outside "between said computing wheels means for moving each support in succession as it arrives at: a: preadetermined point, means for-preventing such movement after passingzsaid: oint,i a spring arranged tmbca-r against sa-i rmovable support, and a. -1ug.-. on: each.- support limitingutss position; substantiallyias described.

In an apparatus of thdcharactr described, a; series of computing wheels, each formed withva, hub, airim, aweb connecting said'hub and rimrexternal gear-teeth on the .hllbIOn; one side of theweb; the hub on the other side of the web having a smooth circu lan contour except for: a single concavity and a-puojection ingthe centerof said concavity, smidarimr hav-ing'zinternal gear teeth? on the Same-side as theiextermglilgear teeth, subst-anti all yasalescribedv 118. In amapparatus' of the character described, a series: oficomputingi wheels, each formed with a hub, a rim a web-connecting;- said huband-rim, external gear teethion the hub on one side-of: the web thehub on the. other side of the webhaving. a smooth: circular. contour exeephfor-a singleconcavity and aprojeetioniin-the center of said concavitv, said rim. having internal gear teeth, substentially as described.

19. A computing wheel comprising a rim, a hub, a connecting web, a spur gear fixed upon the hub, and an-internal gear fixed upon the rim, one portion of the hub being cylindrical and having a notch and a projection.

20. The combination with a series of traveling adding wheels, and tens-carrying devices, of a series of movabledevices for moving said tens-carrying devices to idle positions to break the transfer, and a fixed bar to prevent such movement accidentally.

21. In a computing machine, two primary elements, one consisting of a gang of computing wheels, and the other consisting of a master-wheel, said primary elements being relatively movable in the direction of the axes of the computing wheels, to enable said master-wheel to operate them in succession, and all of said computing wheels provided with .devices for carrying tens from one wheel to another, each tens-carrying device comprising a pinion, in combination with means dependent upon the relative move: ment of said primary elements'for moving the pinions successively to inoperative positions, to break the train of computing mechanism where required, to prevent tens from being carried beyond the desired number of computing wheels.

In a computing machine, the combination of a gang of computing wheels all provided with devices for carrying tens from one wheel to another, each tens-carrying device comprising a pinion permanently in positive mesh with gear teeth provided upon the wheel of high denomination, and also comprising a Geneva movement in connection,with the wheel of low denomination, whereby said wheel of high denomination is prevented from rotating, a master-wheel for said gang of computing wheels, said master-wheel and said gang of computing wheels being relatively movable, and means dependent upon such relative movement to disable the pinion and Geneva movement of the low denomination, to permit the operation of the computing wheel by the masterwheel.

23. In a computing machine, the combination of-a gang of computing wheels all provided with devices for carrying tens from one wheel to another, each tens-carrying device comprising a pinion in mesh with a gear provided upon the wheel of high denomination, and also comprising a Geneva movement in connection with the wheel of low denomination, whereby said wheel of high denomination is prevented from rotating, a master-wheel for said gang of computing wheels, said master-Wheel and said gang of computing wheels being relatively movable, means dependent upon such relative movement to disable the pinion and Geneva movement of the low denomination, to permit the operation of the computing wheel by the master-wheel, and means also dependent upon such relative movement for disabling the tens-carrying devices, to break the train of computing mechanism, to prevent tens from being carried beyond a certain number of computing wheels.

24-. In a computing machine, the combination with a computing wheel carrying gear teeth, of a transfer wheel having a gear meshing with said gear teeth, a lock for a computing wheel operated by said transfer wheel, means for releasing said look by movement of said transfer wheel, and means for positively holding said transfer gear at all times in mesh with gear teeth on said computing wheel.

In a computing machine, the combination with a computing wheel carryinggear teeth, of a transfer wheel 'having a gear meshing with said gear teeth, and carrying a locking member for a computing wheel, means for releasing said lock by movement .of said transfer wheel, and means for positively holding said transfer gear at all times in mesh with get r teeth on said computing wheel. I

26. In a computing machine, the combination with a computing wheel carrying a gear, of a transfer wheel having a gear meshing with said first gear, and carrying a locking member for an adjacent computing wheel arranged to transfer a unit to said first wheel from its adjacent wheel, means for moving said transfer wheel with its locking member to free said adjacent computing wheel, and a second gear on said first computing wheel to mesh with said transfer wheel to hold'the gears of the transfer wheel and computing wheel always in alinement. i

27. In a computing machine, a number wheel having three sets of gearing. a transfer whee having one set of gearing, two of which first gears cooperate with said transfer wheel gearing, and a master wheel which slides inside the number wheels driving said number wheels by the third of said first gears.

98. In a combined typewriting and computing machine, the combination with a step-by-step feeding carriage, of a gang of computing wheels. a master wheel; means being connectedto said carriage to produce a relative step-by-step movement laterally.

between the master wheel and the computing wheels, so that the master wheel may operate upcn the computing wheels scriafi-m. means to cooperate with said master wheel for running up numbers in said computing wheels as they are printed by the type writing mechanism, a series of transfer dcvices for said computing wheels, and means dependent upon the movement of the stepby-step devices for holding one transfer device at a time inoperative, thereby to eon-' computing wheels and transfer mechanism .therefor, a master wheel for engagingsaid computing wheels sem'cztim in a mannerdetermined by said carriage, and means for disconnecting said transfer mechanism controlled by the movement of the carriage at a wheel not engaged by said master wheel.

30. The combination with a typewriting machine having a traveling carriage, of computing mechanism comprising a train of computing wheels and transfer mechanism therefor carried by the carriage, and a fixed member arranged to break said train.

31. The combination with a typ ewriting machine having a traveling carriage, of a gang of computing wheels, means controlled by said carriage for printing numbers and recording them in-said computing wheels, a master wheel for carrying into the computing wheels numbers represented by the numeral keys operated, a series of transfer and locking devices geared with said computing wheels, means controlled by said carriage for releasing the lock of a com uting wheel engaged by the master whee and means holding said transfer devices always in'mesh with said computing wheels.

32. The combination with a typewriting machine having a traveling carriage, of a series of wheels bearing numbers, a series of devices to carry over from one number wheel to the next, numeral keys, means controlled by said carriage for carrying numbers recorded by said numeral keys into said number wheels, and a wheel on each of said carry over devices permanently engaging the number wheel of lower denom1na tion and constantly locking the wheel of higher denomination.

' The combination with a typewriting machine having a traveling carriage, of a series of wheels bearing numbers, a series of devices to carry over from one number wheel to the next, numeral keys, each of said carry over devices including a wheel which ispermanently positively engaged to the number bearing wheel, and means con-- trolled by said carriage for carrying numbers recorded by said numeral keys into said number wheels.

34. In a computing mechanism, a series of computing wheels, a series of transfer wheels respectively intermediate between the computing wheels to form a transfer train, means whereby the computing Wheels are successively rotated, and means for antomatically holding disengaged one of the transfer wheels from the corresponding computing wheels to break the train of transfer, substantially as described.

35. In a computing-mechanism, a series of computing wheels, a series of transfer wheels respectively intermediate between thecomputing wheels to form a transfer train, means whereby the computing wheels are successively rotated, means for auto-.

matically holding disengaged one of the transfer 'wheels from the corresponding computing wheels to break the train of transfer, and means for locking against rotation, except that caused by the transfer, all wheels except that at the operating point, substantially as described.

36. The combination with a series of computing wheels, a master-wheel common to said wheels and means whereby computation can be commenced at any point in the series, of devices forming with said series a train of tens-carrying mechanism, and automatic means for interrupting said train to prevent tens from being carried to more than a predetermined number of computing wheels.

37. The combination of a series of computing wheels, there being one computing wheel for each writing space, excepting each fourth space, a master wheel 'common to said wheels, tens-carrying devices for said wheels, and automatic means for preventing tens from being carried to higher'denominations beyond a certain point in the row of wheels.

38. The combination with a series of computing wheels, and a master wheel, of a series of tens-carrying devices normally in effective positions, means located adjacent to said master wheel for moving the tenscarrying devices to idle positions one at a time, and automatic means to prevent tens vfrom being carried beyond a certain point.

39. In a computing machine, the combination with a master wheel, of a gang of computing wheels, all provided with devices for carrying tens from. one wheel to another,

and automatic means for interrupting the tens-carrying operation, to. prevent tens from being carried beyond a certain number of wheels in said gang.

40. In a computing machine, the combination with a master wheel, of a gang of computlng wheels all provided with devices for carrying tens from one wheel to another, each tens-carrying device comprising a'pinion,'and automatic means for moving the pinions to inoperative positions to break the train of computing mechanism where re quired.

41. In a computing machine, two primary elements, one consisting of a gang of computing wheels, and the other consisting of a master wheel, said primary elements being relatively movable in the direction of the axis of the computing wheels, to enable said master wheel to operate them in succession, and all of said computing wheels provided. with devices for carrying tens from one wheel to another, in combination with automatic means associated with one of said primary elements, so that there may be relative movement between said means and the other of said primary elements, for preventing tens from being carried beyond a certain number of wheels in said gang.

42. The combination with a back plate, of a thin plate having a recess embracing said back plate, a computing wheel, a thin hub on said wheel journaled on said thin plate, a larger hub on said wheel, a second thin plate, and a carry-over device carried by said second plate cooperating with said larger hub.

43. The combination witha back plate, of a thin plate having a recess embracing said back plate, a computing wheel, a thin hub on said wheel journaled on said thin plate, a larger hub on said wheel, a second thin plate, a carry-over wheel carried by said second plate cooperating with said larger hub, a spring holding said carry-over wheel normally efiective, and means for moving said wheel to'inefi'ectit e position.

44. In a computing machine, the combination with a wheel having peripheral and internal teeth, of a wheel having one set of teeth, means for causing said second wheel to turn said first wheel when engaged with said peripheral teeth but to idly engage said internal teeth, a wheel similar to said first wheel whereby said second wheel may be turned, and internal teeth on said first wheel whereby it may be turned.

45. The combination with a multiple series of computing wheels, and a master wheel common to said wheels, said master wheel adapted to engage them sem'atim, whereby computation can be commenced at any point in the series, of devices forming with said series a train of tens-carrying mechanism, and means fixed relatively to the master wheel for interrupting said train to prevent tens from being carried to more than a predetermined number of computing wheels from the master wheel.

46. In a computing machine, the combination with a master wheel, of a gang of computing wheels adapted to engage said master wheel seflatz'm, v said computing wheels all provided with devices for carrying tens from one wheel to another. each tens-carrying device com rising a pinion,

' and .means fixed relative y to the master wheel for'moving' the pinions to inoperative positions to break the train of. computing mechanism where required at a predetermined distance from the master wheel.

47. In a computing machine, two primary elements, one consisting of a gang of computing wheels, and the other consisting of a master wheel, said primary elements being relatively movable in the direction of the axis of the computing wheels, to enable said master wheel to operate t-hem in succession, and all of said computing wheels provided with devices for carrying tens from one wheel to another, in combination with silencing means associated with one of said pri-. mary elements to be affected by said relative movement, for preventing tens from being carried beyond a predetermined distance from said master wheel. 48. In a computing machine, the combination with a wheel having a set of internal teeth, whereby said wheel is turned for computing, and also having peripheral teeth, of a tens-carrying wheel having one set of teeth to engage said peripheral teeth on the firstnamed wheel, whereby said first named wheel is turned for carrying over, the firstnamed wheel also having a second set of internal teeth, whereby said tens carrying wheel maybe held againstaccidental rotation; the peripheral teeth on said firstnamed wheel being arranged between the sets of internal teeth thereof.

49. In a computing machine, the combination with a wheel having peripheral and internal teeth, of a tens-carrying wheel having one set of teeth to engage either, whereby said first wheel may be turned by said second, and whereby said tenscarrying wheel may be held against accidental rotation as set forth, and a third set of teeth on said first wheel,-said teeth being internal whereby said firstwheel may be turned.

50.In a computingmechanism, the combination with a series of computing wheels, a series of tens-carrying trains therefor, a master wheel or member, and means for driving or rotating said master Wheel or member, of means for silencing a tens-carrying train, to prevent tens froinbeing carried beyond a certain point; means being provided for causing relative step-by-step movement between the series of computing wheels and both the master wheel and said silencing means.

51. In a computing-mechanism, the combination with a series of computing wheels, a series of tens-carrying trains therefor, a master wheel or member, and means for driving or rotating said master wheel or member, of means for silencing, a tens-carrying train, to prevent tens, from being carried beyond a certain point; means being provided for causing a relative step-by-step movement between the series of computing Wheels and both the master wheel and said my hand in the presence of twesubscribing iilencing means, and provision being made witnesses.

0r locking tie com utin wheels against rotation; and means to rel ease the comput- WALTER WRIGHT is ing Wheel with which the master wheel is Witnesses:

in engagement. F. M. WRIGHT,

In testimony whereof I have hereunto set NELLIE B. KEATING. 

